Just a few months before his death in 2011, Steve Jobs announced plans to build a new corporate campus for Apple in Cupertino City, California. Since then the initial $3 billion price tag for the extravagant spaceship-like development has jumped to an estimated $5 billion, according to Bloomberg BusinessWeek. Apple’s new HQ, designed by Foster + Partners, will cost more than the $3.9 billion being spent on the new World Trade Center complex in New York – an estimate which triggered criticism from the business community and company’s shareholders.

The Apple Campus 2 will accommodate 12,000 employees and will have roughly 260,000 square meters of office spaces, corporate fitness facilities, auditoriums and a cafeterias that could handle lunch for 3,000 employees. The exterior curved glass walls will be made from pricey floor-to-ceiling panes of concave glass from Germany. Temperature control systems will be used to automatically open windows for fresh air, while Sulartubes will pipe sunlight across the complex.

At the company’s annual meeting on Feb. 27, Chief Executive Officer Tim Cook pushed the move-in date from 2015 to 2016. The decision was connected to the company’s decision to cut $1 million from the budget before proceeding with the work, according to sources close to the project. The company will start tearing down the 26 buildings on the site in June. The excavations of the site will last six months and will require a 24-hour convoy of trucks, said a former Apple manager.